It's not like, 'Tonight! Second episode, we're not friends anymore,'" Brandi tells Today. "It takes a while for everything to unfold. So... we do the same banter for most of the season."

"You'll see a different side of Lisa this season," Brandi continues. "The first part, we're just picking up from where last season left off, and we're all in the same place and everything's fine and normal."

Then, things go bad when the ladies take a trip to Puerto Rico. "And then, we go on vacation together!" she adds. "But really, that's when the crap hits the fan."

Brandi says she really resents Lisa for her closeness with Vanderpump Rules star Scheana Marie, who hooked up with Eddie Cibrian while he was married to Brandi. "It just really hurts me," Brandi says of Lisa and Scheana's friendship, teasing that "I find out other things" about Lisa and Scheana as the season progresses.

Brandi says she didn't want the existing drama to affect her friendships with newbies Carlton Gebbia and Joyce Giraud. "I've said to both of them, 'My issues with this person have nothing to do with you,'" Brandi says. "Carlton is kind of like, 'Cool, that's great.' And the other one [Joyce] just jumps right into the fighting with everyone!"

So it sounds like Brandi's fighting with Lisa will contribute to her falling out with Joyce. Will Brandi ever patch things up with either of them? Hmmm...